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1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // GZIP output stream functions |
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15 // |
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16 |
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17 #include "xmlenggzipoutputstream.h" |
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18 #include <ezstream.h> |
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19 #include <ezcompressor.h> |
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20 |
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21 /** |
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22 * Default input buffers size. |
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23 */ |
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24 static const TInt KDefaultInputBufferSize = 4096; |
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25 |
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26 /** |
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27 * Output buffer size. It determines, how often output data will be written |
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28 * to disk. (it's written to disk, when buffer is full. |
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29 * |
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30 */ |
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31 static const TInt KOutputSize = 0x1000; |
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32 |
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33 |
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34 CXmlEngGZIPOutputStream* CXmlEngGZIPOutputStream::NewLC(MXmlEngOutputStream& aOutputBuffer ) |
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35 { |
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36 CXmlEngGZIPOutputStream* gzbos = new (ELeave) CXmlEngGZIPOutputStream( aOutputBuffer ); |
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37 CleanupStack::PushL( gzbos ); |
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38 gzbos->ConstructL(); |
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39 return gzbos; |
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40 } |
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41 |
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42 CXmlEngGZIPOutputStream* CXmlEngGZIPOutputStream::NewL( MXmlEngOutputStream& aOutputBuffer ) |
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43 { |
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44 CXmlEngGZIPOutputStream* gzbos = CXmlEngGZIPOutputStream::NewLC( aOutputBuffer ); |
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45 CleanupStack::Pop( gzbos ); |
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46 return gzbos; |
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47 } |
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48 |
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49 CXmlEngGZIPOutputStream::CXmlEngGZIPOutputStream( MXmlEngOutputStream& aOutputBuffer ) |
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50 { |
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51 iOutputString = &aOutputBuffer; |
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52 iKeepGoing = ETrue; |
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53 } |
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54 |
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55 void CXmlEngGZIPOutputStream::ConstructL() |
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56 { |
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57 //we can't create compressor here, because we heve no input at this moment |
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58 iOutputDescriptor.CreateL( KOutputSize ); |
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59 iInputDescriptor.CreateL( KDefaultInputBufferSize ); |
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60 iOldInputDescriptor.CreateL( KDefaultInputBufferSize ); |
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61 } |
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62 |
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63 CXmlEngGZIPOutputStream::~CXmlEngGZIPOutputStream() |
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64 { |
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65 delete iCompressor; |
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66 iOutputDescriptor.Close(); |
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67 iInputDescriptor.Close(); |
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68 iOldInputDescriptor.Close(); |
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69 } |
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70 |
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71 TInt CXmlEngGZIPOutputStream::Write( const TDesC8& aBuffer ) |
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72 { |
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73 TRAP ( iError, WriteL( aBuffer ) ); |
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74 if ( iError ) |
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75 { |
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76 return -1; |
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77 } |
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78 |
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79 return aBuffer.Size(); |
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80 } |
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81 |
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82 void CXmlEngGZIPOutputStream::WriteL( const TDesC8& aBuffer ) |
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83 { |
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84 iNoInputNeeded = ETrue; |
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85 if ( !iCompressor ) |
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86 { |
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87 const TInt newLength = aBuffer.Size(); |
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88 if ( newLength > iInputDescriptor.Size() ) |
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89 { |
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90 iInputDescriptor.ReAllocL( newLength ); |
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91 } |
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92 iInputDescriptor.Copy( aBuffer ); |
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93 iCompressor = CEZCompressor::NewL( *this ); |
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94 } |
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95 else |
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96 { |
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97 iInputDescriptor.Swap( iOldInputDescriptor ); |
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98 const TInt newLength = aBuffer.Length(); |
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99 if ( newLength > iInputDescriptor.MaxLength() ) |
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100 { |
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101 iInputDescriptor.ReAllocL( newLength ); |
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102 } |
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103 iInputDescriptor.Copy( aBuffer ); |
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104 |
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105 while ( iNoInputNeeded ) |
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106 { |
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107 iCompressor->DeflateL(); |
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108 } |
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109 } |
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110 } |
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111 |
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112 TInt CXmlEngGZIPOutputStream::Close() |
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113 { |
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114 iCloseInvoked = ETrue; |
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115 TRAP ( iError, CloseL() ); |
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116 if ( iError ) |
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117 { |
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118 return -1; |
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119 } |
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120 return KErrNone; |
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121 } |
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122 |
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123 void CXmlEngGZIPOutputStream::CloseL() |
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124 { |
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125 while ( iKeepGoing ) |
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126 { |
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127 iKeepGoing = iCompressor->DeflateL(); |
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128 } |
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129 } |
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130 |
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131 TInt CXmlEngGZIPOutputStream::CheckError() |
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132 { |
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133 return iError; |
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134 } |
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135 |
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136 void CXmlEngGZIPOutputStream::InitializeL( CEZZStream& aZStream ) |
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137 { |
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138 aZStream.SetInput( iInputDescriptor ); |
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139 aZStream.SetOutput( iOutputDescriptor ); |
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140 iNoInputNeeded = EFalse; |
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141 } |
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142 |
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143 void CXmlEngGZIPOutputStream::NeedInputL( CEZZStream& aZStream ) |
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144 { |
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145 if ( iCloseInvoked ) |
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146 { |
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147 aZStream.SetInput( KNullDesC8 ); |
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148 } |
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149 else |
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150 { |
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151 aZStream.SetInput( iInputDescriptor ); |
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152 iNoInputNeeded = EFalse; |
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153 } |
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154 } |
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155 |
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156 void CXmlEngGZIPOutputStream::NeedOutputL( CEZZStream& aZStream ) |
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157 { |
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158 TPtrC8 od = aZStream.OutputDescriptor(); |
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159 TInt res = iOutputString->Write(od); |
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160 if (res < 0) |
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161 { |
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162 User::Leave(res); |
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163 } |
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164 aZStream.SetOutput( iOutputDescriptor ); |
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165 } |
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166 |
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167 void CXmlEngGZIPOutputStream::FinalizeL( CEZZStream& aZStream ) |
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168 { |
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169 TPtrC8 od = aZStream.OutputDescriptor(); |
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170 TInt res = iOutputString->Write(od); |
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171 if (res < 0) |
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172 { |
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173 User::Leave(res); |
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174 } |
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175 res = iOutputString->Close(); |
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176 if (res < 0) |
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177 { |
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178 User::Leave(res); |
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179 } |
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180 } |
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181 |